496 HO - Remove Turbulator and Lost Speed?
Has anyone removed the turbulators on their late model 496HOs and lost some speed?
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I did it in my fountain and noticed no change up or down.
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Don't have 496's , but experimented on my 6.2's [ 377cu]
removing the turbulators on the port engine first. Didn't make any difference , rpm's [ speed] stayed the same. Same result for the starboard engine. The exh ports at the riser joints are small for both 496 and 377 , so the turbulator really doesn't make a diff in or out. Putting mufflers on or slip ins at the tips would affect rpm's at WOT , dropping as much as up to 200, hence loosing speed. The turbulators get red hot at high rpm's and burn up water droplets [ condensation ] while going down to idle while the engine cooling down. It's a Merc warranty issue . An aftermarket exhaust manifold/riser and slightly more cam would be your best bet for some performance gains. |
Spectras, Thanks for the advice. Unfortunately, Considering that I would have to take the motors out anyway to install the headers, it would be a tough call to spend 10k on a set of headers when for roughly the same price I could drop in a set of 525s with around the same amount of hours. With a 525 I would pick up over twice the power gains and also leave room for improvement ala a Whipple kit which would last much longer on the better stock bottom end than on a 496. If i can get a better deal, I may think a little hard about it but given that the 496 needs ALOT of parts to really get where i want to be It will be cheaper in the long run to get another set of motors.
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$10K that is a stretch for Blue power... In this market you couldnt get more that $3000 a piece for used 496 HO's...
You can buy new 496 Mag HO's from IMCO for $5000! Checked out - If you take the manifolds off and have them ported, you might pick up 100 RPM. A few people on OSO have been successful porting them. Even when I installed Stainless Marine Manifolds and reprogrammed the ECU I only picked up 150-200RPM. |
Originally Posted by Keith Atlanta
(Post 2935170)
$10K that is a stretch for Blue power... In this market you couldnt get more that $3000 a piece for used 496 HO's...
You can buy new 496 Mag HO's from IMCO for $5000! Wow that is rough........Considering that dealer cost is 14k. I would believe that when I see it. They probably dont have a warantee and were out of a repo or sunk boat. |
Checkedout, did you attend our Harrison Lake Poker run ?
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Originally Posted by spectras only
(Post 2935190)
Checkedout, did you attend our Harrison Lake Poker run ?
No. Unfortunately. Maybe next year. |
Originally Posted by CheckedOut
(Post 2935181)
Wow that is rough........Considering that dealer cost is 14k. I would believe that when I see it. They probably dont have a warantee and were out of a repo or sunk boat.
Truck motor with some marine parts. I just shopped all over for 496 HO's with warranty and paid more than I would have liked. 525's are higher in price then metioned as well from what I found. |
Originally Posted by CheckedOut
(Post 2935166)
Spectras, Thanks for the advice. Unfortunately, Considering that I would have to take the motors out anyway to install the headers, it would be a tough call to spend 10k on a set of headers when for roughly the same price I could drop in a set of 525s with around the same amount of hours. With a 525 I would pick up over twice the power gains and also leave room for improvement ala a Whipple kit which would last much longer on the better stock bottom end than on a 496. If i can get a better deal, I may think a little hard about it but given that the 496 needs ALOT of parts to really get where i want to be It will be cheaper in the long run to get another set of motors.
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